Page 83 - Chemistry - XI

Q13. The brown ring formed in ring test for NO is due to:
−
3

(a) Fe HO NO SO (b) FeSO NO (c) Fe HO NO (d) FeSO NO 2

2

4
2
4
2
5
4
5
Q14. Which of the following gives scarlet of red ppt with DMG (dimethyl glyoxime) in presence of
NH OH?
4
(a) Mn (b) Zn (c) Ni (d) Co 2+
2+
2+
2+
Q15. Which of the following will form blue ppt with Zn (aq)?
2+

(a) KFeCN (b) KFeCN (c) NH OH (d) (NH )SCN
6
4
6
3
4
4
Q16. Which of the following ions does not give precipitate with AgNO (aq)?
3
(a) Cl (b) Br (c) I (d) F –
–
–
–
Q17. Which of the following will give visible reaction?
(a) Ca(NO ) +NH OH (b) PbCO + HCl (c) ZnCl + Ba(NO ) (d) NaOH and NH
3 2 4 3 2 3 2 3
Q18. A compound reacts with dil. H SO and forms a gas with smell of rotten eggs which turns lead
4
2
acetate paper black, the ion present in salt is:
(a) Cl (b) S (c) SO − 3 (d) NO − 2
2–
–
Q19. When dil. H SO was added to a salt, a brisk eff ervescence was observed which turned lime
4
2
water milky. Addition of excess of NH OH formed green precipitate. Identify the salt.
4
(a) FeSO (b) FeCO (c) CuCO (d) CuSO
2 3 3 4
Q20. Alum or potassium aluminium sulphate is used for water treatment to remove certain heavy
metal ions and other impurities from water during fi ltration. Aqueous alum is also acidic.
Which of the following ions cannot be removed by alum?
3
(a) Fe (b) Pb 2+ (c) CO 2− (d) OH –
2+
Q21. A colourless solution was treated with aq. NaOH, white ppt was formed which is insoluble in
excess of NaOH. The ion present in salt will be:
(a) Fe (b) Cu (c) Ca (d) Pb 2+
2+
2+
2+
Q22. Which of the following gases will form white ppt with Ca(OH) (aq)?
2
(a) SO (b) NH (c) CO (d) Both (a) and (c)
2 3 2
Q23. An unknown salt gives brisk eff ervescence with dil. H SO and gas formed turns lime water
4
2
milky and extinguishes burning match stick, the salt is:
(a) NaNO (b) NaCl (c) CaCo (d) Na S
3
2
3
Q24. Which of the following produces ammonia gas when heated with (NH ) CO ?
3
4 2
(a) H O (b) dill. H SO (c) aq.AgNO (d) dill. NaOH
4
2
2
3

Q25. Which of the following in aqueous solution will form yellow ppt. with aq. Pb NO ?
3 2
(a) ZnCO (b) CuSO (c) KI (d) KCl
3 4
Answer key
1. (a), 2. (b), 3. (a), 4. (c), 5. (d), 6. (a), 7. (d), 8. (d) , 9. (b), 10. (a), 11. (b), 12. (d) , 13. (a), 14. (a),3. (a), 4. (c), 5. (d), 6. (a), 7. (d), 8. (d) , 9. (b), 10. (a), 11. (b), 12. (d) , 13. (a), 14. (a),
1. (a), 2. (b),
15. (a), 16. (d), 17. (d), 18. (b), 19. (b), 20. (d), 21. (c), 22. (d), 23. (c), 24. (d), 25. (c)
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